Colored cement structure and process of making same.



UNITED STATES PA ENT OFFICE.

HENRY A. GARDNER, OF WASHINGTON, DISTRICT OF COLUMBIA.

COLORED CEMENT STRUCTURE AND PROCESS or MAKING-SAME.

No Drawing.

To all whom it may concern:

Be it known that I, HENRY A GARDNER, a citizen of the United States, residing at Washington, in the District of Columbia, have invented certain new and useful Improvements in Colored Cement Structures and Processes of Making Same, of which the following is a specification.

This invent-ion relates to processes of making colored bodies or structures of Portland and like cement, and to the structures so produced.

It is characteristic of my process that cement structures colored in accordance therewith are also improved in respect to their resistance to water, and in many cases at least in respect to their hardness or resistance to attrition or wear.

My invention may be carried out as follows 2 00 arts ofrosin (colophon are saponi ed in a solution consisting 0 about 800 parts of water and 15 parts of-caustic soda or potash. A clear aqueous solution of sodium or potassium resinate is thus ob tained, To this solution is added 1500 parts, more or less, of a suitable coloring matter,

' such as chromic oxid, ferric oxid, ultramarine blue or the like. The mixture is thoroughly ground in a paint mill to smooth and even consistence. This igment composition is then thoroughly mixed, in proportion to give the desired color, with a mixture of cement and water, or of cement, sand and water, accordingto theresul sought. Usually five per cent. of pigment is sufficient to color 100 parts of cement, dry weights.v of both being referred to. After thoroughly mixing the color with the cement, the composition is permittedto harden in forms in the usual manner. The hardening takes place inabout the normal time, and the resulting uniformly colored body is not only nearly or quite waterproof, but is highly re- Specification of Letters Patent.

Patented Aug. 4, 1914.

Application filed October 30, 1913. Serial No. 798,351.

sistant to attrition. It maybe assumed that the calcium compounds of the cement react with the soluble resinate with formation of an insoluble calcium 'resinate.

My invention is not restricted to the particular proportions above mentioned as illustrative.

It will be observed that the foregoing processdoes not involve the use of fatty acids, glycerids, or drying-oils, nor of organic solvents or thinners of any kind The vehicle for the pigment is an aqueous solution of a water-solublesoap prepared from colophony or other suitable resin, the soap solution serving to carry the pigment rapidly and uniformly to every portion of the 'cementitious mass, and rendering it possible material, and permitting the mass to harden.

2. The process of making colored cement structures, which. consists in compounding a pigment with an aqueous solution of a resin soap, incorporating the resulting mixture with a cement Or concrete in'proportion to impart the desired color, and per mitting the mass to harden.

3. A colored cement structure comprising a calcareous cementitious material, a pigment, and the reaction products of a watersoluble resin soap with said cementitious material. a g Y In testimony whereof I affix my signature in presence of two witnesses.

. HENRY A. GARDNER.

Witnesses:

Jos. H. BLACKWOOD, CHARLES H. Forum. 

